The Patent Finder
US

Ret for Optical Maskless Lithography

US 7,618,751 In force
OverviewFamilyAssignmentsSources & methods

Term ends Jun 19, 2028 · High confidence

Filed Feb 25, 2005 as application 11/066,828 · Granted Nov 17, 2009
Base term plus 1210 days of patent term adjustment (USPTO delay)
Today
20 years from filing
2005 2028
Clock starts
Feb 25, 2005
Term ends
Jun 19, 2028
Granted
Nov 17, 2009
base term patent term adjustment fee events Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
1,210
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
3
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

This patent's term runs 1210 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. Confidence: High. from the record

How we calculated this date

One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
StepInputDate after this stepConfidence
Base term, 20 years from filingClock starts Feb 25, 2005, when this application, 11/066,828, was filedFeb 25, 2025High confidence
Continuity chainEvery parent in the chain resolvedno changeHigh confidence
Patent term adjustment+1210 days, USPTO patent term adjustment recordJun 19, 2028High confidence
Terminal disclaimer capNone on recordno cap appliedHigh confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events3 of 3 maintenance fees paidIn forceHigh confidence
Computed term endThe steps above, in orderJun 19, 2028High confidence

This family

US 7,110,159Term ended
Dec 2024
Dec 2024
US 7,618,751this patent
Jun 2028
Jun 2028
Application 11/228,022Abandoned
not computed
not computed
The applications whose file history this site holds. The family may have others.

Assignments

Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
RecordedAssignorAssigneeConveyance
Feb 25, 2005
Reel 16341, frame 25
Sandstrom, Torbjorn; Martinsson, HansMicronic Laser Systems ABAssignment of Assignor's Interest
Jun 17, 2005
Reel 17017, frame 274
Sandstrom, Torbjorn; Martinsson, HansMicronic Laser Systems ABAssignment of Assignor's Interest
Nov 12, 2008
Reel 21817, frame 782
Micronic Laser Systems ABASML Netherlands B.V.License
Jun 17, 2009
Reel 22835, frame 217
Micronic Laser Systems ABASML Netherlands B.V.Release of License Agreement
Jul 8, 2009
Reel 22917, frame 810
ASML Netherlands B.V.Micronic Laser Systems AB (publ)Termination of License Agreement

Sources

Google Patents · The patent document at USPTO · Assignment records at USPTO

USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup

Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.

The Patent Finder CompaniesExpirationsCalculatorWatchlistPricing MethodologyCorrectionsLegalPrivacysupport@thepatentfinder.com Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited